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Charles Greeley Abbot with light filter apparatus, circa 1934

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Description

Charles Greeley Abbot examines a light filter apparatus. Technology Review, February 1934, p. 172. Original Credit Line: Underwood & Underwood, 854734.

Original Caption: "E. P. Jones."

Original Caption: "Charles G. Abbot, '94, Secretary of the Smithsonian Institution, examining a new filter for studying effects of colored light on plants".

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